Full-stack, DevOps, QA & delivery, senior end to end
Theia Software brings together senior specialists, frontend, backend, DevOps/cloud, QA and delivery management, so every layer of your project gets senior-level attention, not junior hand-offs. Our deepest track record is in payments and fintech (PCI DSS-compliant microservices, high-volume platforms), but the same team takes on e-commerce, SaaS, internal tools and everything in between.
We build software solutions from the ground up, zero to production, with an experienced senior team.
One senior team, every layer
React & TypeScript interfaces built by a senior frontend specialist.
ASP.NET Core, microservices and architecture, led hands-on in-house.
AWS/Azure infrastructure and CI/CD, run by a senior DevOps collaborator.
Dedicated quality assurance, so what ships is actually tested.
Senior project delivery, so your team always knows where things stand.
Theia Software leads architecture and backend development directly; frontend, DevOps, QA and delivery are covered by a network of senior collaborators, brought in project by project.
Technologies we build with
What we do
Every card below maps to a system we've personally designed and shipped: real proof, not theory, and a sample of our depth, not a limit on what we can build.
Practical AI, wired into systems you already run: LLM-powered features, retrieval-augmented search over your own data, AI-assisted document/OCR processing, and workflow automation, integrated into your existing .NET/React stack rather than bolted on as a separate app.
Card tokenization, encrypted card-data storage, settlement flows and PCI DSS-compliant infrastructure for high-volume transaction processing (POS & online).
ASP.NET Core microservices, REST APIs, DDD/CQRS with MediatR, designed to handle tens of thousands of daily transactions reliably.
AWS (EKS, RDS Aurora, S3, IAM, KMS) and Azure infrastructure, Docker/Kubernetes deployments, and CI/CD pipelines with GitLab, Jenkins and SonarQube quality gates.
Modern, responsive React & TypeScript frontends paired with robust .NET backends; end-to-end delivery from database to UI.
PCI DSS audit preparation, OWASP Top 10 code reviews, encrypted storage design (varbinary/KMS) and IAM-based access control.
Thread-safe background services, RabbitMQ messaging pipelines and multithreaded processing for reliable performance under load.
Building something that doesn't fit neatly into a category above? That's fine. Most software problems share the same underlying engineering: solid architecture, clean code and reliable delivery. Tell us what you're working on.
Tell us about your projectSelected work
A sample of production and MVP work spanning payments, retail, and SaaS.
Designed thread-safe microservices for POS & online payments on AWS (Aurora MySQL, EKS, KMS). Built card tokenization, encrypted storage and RabbitMQ-based settlement pipelines.
Checkout microservices handling tens of thousands of daily transactions for an international retail client, built with an Agile cross-functional team.
.NET 8 Web API + React platform with recurring payment scheduling, OCR receipt ingestion, JWT auth and AWS S3 file storage.
Real-time device control app with live state updates and a responsive interface.
A full e-commerce experience with engaging UX components, built end-to-end in React and TypeScript.
Built from the ground up: a .NET 8 API used by a car rental company to scan and process customer IDs and driving licenses automatically instead of by hand, using Azure AI Document Intelligence with per-country field and address normalization.
How we work
We start by understanding the domain and constraints, then propose an architecture (microservices, data model, security boundaries) before writing production code.
Iterative delivery with tested, reviewed code (xUnit/NUnit, SonarQube), CI/CD from day one, and direct access to the engineers building your system, backed by senior delivery management to keep things on track.
Deployment to your cloud (AWS/Azure), monitoring, and, where relevant, a PCI DSS / OWASP compliance review before go-live.
Ongoing ownership of the systems we build: performance tuning, new features, and architecture evolution as you grow.
About Theia Software
We ship the kind of code we'd be comfortable getting paged for at 3 a.m.
Theia Software is built around 10+ years of senior full-stack .NET & React engineering experience across startups and enterprise teams, including sole ownership of the backend architecture for a PCI DSS-compliant payments platform, and large-scale retail systems processing tens of thousands of transactions a day.
Theia Software leads architecture and backend development directly on every project. Frontend, DevOps/cloud, QA and delivery management are covered by a network of senior collaborators, brought in project by project, so every layer of the work stays senior; no junior hand-offs, no bloated account-management layers.
The projects shown here are proof of execution, not a boundary. If what you're building looks nothing like them, that's a reason to talk to us, not a reason not to.
Get in touch
Tell us about what you're building: payments, a new platform, or an existing system that needs senior engineering support. We usually reply within one business day.
